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16 September 2003 <br /> AGE-NC Project No 98-0452 <br />' Page 3 of 4 <br /> 3 2 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g was detected for the first time since ground water monitoring began in 1999, at a <br />' concentration of 220 micrograms per liter(µg11) in monitoring well MW-2 which is cross gradient <br /> of the former UST area <br /> BTEX compounds were not detected at or above laboratory reporting limits in the four ground water <br /> samples analyzed <br />' MTBE was detected by EPA Method 8260B in the ground water samples collected from MW-2 and <br /> MW-3 at concentrations of 220 µg/1 and 40 µg/l,respectively No other fuel additives were detected <br /> at or above laboratory reporting limits <br /> Analytical results of ground water samples are summarized on Table 2 The laboratory report <br /> yt <br /> (CTEL Project No CT214-0306147) and chain-of-custody forms are included in Appendix C <br /> I <br />' . 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br />' • Average ground water elevation at the site has remained relatively stable since gauging began <br /> in September 2000 <br />' • The ground water gradient was calculated to be 0 017 feet/feet with a flow direction toward <br /> the southwest, which is approximately seven time steeper and more southerly than the now <br /> direction determined during the first quarter 2003 Ground water flow direction during <br /> previous monitoring events has alternated from the northeast to the southwest Local ground <br /> water appears to be influenced by seasonal hydrological changes <br />' • TPH-g was detected for the first time since the initiation of the groundwater monitoring <br /> program in monitoring well MW-2 at a concentration of 220 µg/1 <br /> • BTEX constituents have not been detected at or above laboratory reporting limits in any of <br />' the ground water samples collected and analyzed since initiation of monitoring in November <br /> 1999 <br /> t • MTBE was detected in monitoring wells MW--2 and MW-3 at concentrations of 220µg/1 and <br /> 40 gg/l,respectively The concentrations detected in samples MW-2 and MW-3 exceed the <br /> DHS-Maximum Containment Level for MTBE in drinking water <br /> i <br /> 1 Advanced GeoEnvlronmental,Inc <br /> 1 <br />